text on screen:

“This testimony was given during the Winter Soldier Investigation sponsored by Vietnam Veterans Against the War in Detroit, Michigan, January 31-February 2, 1971”;

testimony of Vietnam War Veterans giving eyewitness accounts of war crimes and atrocities committed by the U.S. Armed Forces and their allies; the nine participants in order of appearance are listed at end of film

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(for more information, see Wikipedia pages viewed Aug. 7, 2018:

https://en.wikipedia.org/wiki/Winter_Soldier_Investigation ; 

https://en.wikipedia.org/wiki/Winterfilm_Collective)

From Wikipedia: The "Winter Soldier Investigation" was a media event sponsored by the Vietnam Veterans Against the War (VVAW) from January 31, 1971, to February 2, 1971. It was intended to publicize war crimes and atrocities by the United States Armed Forces and their allies in the Vietnam War. The VVAW challenged the morality and conduct of the war by showing the direct relationship between military policies and war crimes in Vietnam. The three-day gathering of 109 veterans and 16 civilians took place in Detroit, Michigan. Discharged servicemen from each branch of military service, as well as civilian contractors, medical personnel and academics, all gave testimony about war crimes they had committed or witnessed during the years 1963–1970.